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  10Tin_GiaAn  commented on July 22, 2024, 7:27 a.m.

  include <bits/stdc++.h>

  using namespace std; long long n,a[100000+7]; int main() {
  cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; for(int i=1;i<=n;i++) for(int j=1;j<=n/i;j++) if(ij<=n and a[ij]!=a[i]*a[j]) { cout<<"NO"; return 0; } cout<<"YES"; }